"This is the natural evolution of frequent-flier programs," says Ed Perkins of SmarterTravel.com.

"This is the natural evolution of frequent-flier programs," says Ed...

Oil and gas executive Dan Piette of Houston flies more than 100,000 miles a year and opts for the pricier business- or first-class tickets that offer more legroom - especially forgiving to his 6-foot-6 frame - and overhead bin space than are found in economy.

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